The parity space approach is considered for an application on in-flight FDI (Fault Detection and Isolation). The DDV (Direct Drive Valve) of an electrohydraulic actuator which belongs to the aircraft's primary control path serves as an example. The parity space relations were chosen because of their properties: simplicity (thus online solvable), no feedback (thus the residual does not drift in absence of excitation of the valve). The drawback is that an accurate plant description is needed to improve failure detection and isolation reliability. Consequently, the purpose for this application is to enhance the robustness with respect to model and signal disturbances. First DDV is described with its typical faults. Parity relations and available methods to improve their robustness are introduced. The results for the standard scheme and the further methods are submitted respectively. The application for the on-board fault detection is discussed.
Model based fault detection with parity space relations for a direct drive valve
Modellbasierte Fehlererkennung mit Hilfe der Paritätszustandsgleichungen bei einem elektrischen Direktantrieb
2000
6 Seiten, 9 Bilder, 2 Tabellen, 9 Quellen
Aufsatz (Konferenz)
Englisch
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